Synthesis and Future Research Needs

FIGURE 4 Effects of climate and landscape topography on the concentrations and fluxes of DOC in aquatic ecosystems. Differences in the widths of the arrows indicate differences in relative fluxes of organic carbon within and between terrestrial and aquatic ecosystems. The dashed and curved arrow in the arid climate diagram indicates the potential for large evaporative concentration leading to high DOC concentrations despite relatively low input fluxes. 

Aitkenhead, J. A., and W. H McDowell. 2000. Soil C N ratio as a predictor of annual DOC flux at local and global scales. Global Biogeochemical Cycles 14 127-138. 

Aitkenhead, J. A., D. Hope, and M. F. Billett. 1999. The relationship between dissolved organic carbon in stream water and soil organic carbon pools at different spatial scales. Hydro-logical Processes 13 1289-1302. 

McKnight, and A. S. Denning. 1991. Sources of dissolved and particulate organic material in Lock Vale Watershed, Rocky Mountain National Park, Colorado, USA. Biogeochemistry 15 89-110. 

Butturini, A., and F. Sabater. 2000. Seasonal variability of dissolved organic carbon in a Mediterranean stream. Biogeochemistry 51 303-321. 

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